Esperanto Day ( eo, Esperanto-Tago) is a worldwide observance on 26 July, which celebrates the publication of ''

Unua Libro ''Dr. Esperanto's International Language'' (russian: wikt:международный#Russian, Международный wikt:язык#Russian, язык), commonly referred to as ' (''First Book''), is an 1887 book by Polish ophthalmologist L. L ...

'', the first book in the

Esperanto Esperanto ( or ) is the world's most widely spoken constructed international auxiliary language. Created by the Warsaw-based ophthalmologist L. L. Zamenhof in 1887, it was intended to be a universal second language for international communi ...

language, by the language's creator,

L. L. Zamenhof L. L. Zamenhof (15 December 185914 April 1917) was an ophthalmologist who lived for most of his life in Warsaw. He is best known as the creator of Esperanto, the most widely used constructed international auxiliary language. Zamenhof first dev ...

on this day in 1887. The annual multi-day

World Esperanto Congress The World Esperanto Congress ( eo, Universala Kongreso de Esperanto, UK) is an annual Esperanto convention. It has the longest tradition among international Esperanto conventions, with an almost unbroken run for 113 years. The congresses have be ...

is held around this time.

See also